Abstract

During nine field trips from December 2008 to September 2010, 357 species of butterflies were found at Argentina's Teyú Cuaré Provincial Park and Osununú private reserve, in the Interior Atlantic Forest biome. A list of these species is presented here, representing the first list of Lepidoptera from southern Misiones. A number of species typical of Brazilian and Paraguayan cerrado vegetation, such as Eurytides dolicaon deicoon, Aricoris aff. colchis and Cogia hassan evansi, were found in this study. This suggests a possible movement of these species from northern latitudes through gallery forests along the Paraná river. The species Napaea eucharila (Bates, 1867) and Pompeius dares (Plötz, 1883) are new records for the country. Additional species should eventually be recorded, especially within grassland on the outskirts of Osununú reserve, when we expand our sampling efforts to other times throughout the year.